| Abbreviation | Definition |
|---|---|
| AMIMechE | AMIMechE: Associate Member of the Institution of Mechanical Engineers |
| AMIT | Assistant Manager In Training |
| AMRT | Applied Microbial Remediation Technician |
| AMSS | Alarm Management Systems Specialist |
| ANP | Adult Nurse Practitioner |
| ANUM | Associate Nurse Unit Manager |
| AO | Accountable Officer |
| AO | Auxiliary Operator |
| AOC | Architect Of the Capitol |
| AOD | Administrator On Duty |
| AOD | Area Operations Director |
| AOE | Area Of Effect |
| AOM | Airport Operations Manager |
| AOS | Abandonment Of Services |
| AOS | Adjustment Of Status |
| AOS | Area Of Specialty |
| AOT | Advocate Of Technocracy |
| AP | Addiction Professional |
| AP | Assistant Pastor |
| AP | Associate Pastor |